Recently, multiparticle-correlation measurements of relativistic p/d/ 3He + Au, p + Pb, and even p + p collisions show surprising collective signatures. In this paper, we present beam-energy-scan measurements of two-, four-, and six-particle angular correlations in d + Au collisions at √ sNN = 200, 62.4, 39, and 19.6 GeV. We also present measurements of two- and four-particle angular correlations in p + Au collisions at √ sNN = 200 GeV. We find the four-particle cumulant to be real valued for d + Au collisions at all four energies. We also find that the four-particle cumulant in p + Au has the opposite sign as that in d + Au. Further, we find that the six-particle cumulant agrees with the four-particle cumulant in d + Au collisions at 200 GeV, indicating that nonflow effects are subdominant. Finally, these observations provide strong evidence that the correlations originate from the initial geometric configuration, which is then translated into the momentum distribution for all particles, commonly referred to as collectivity.

We report the transverse single-spin asymmetries of J/ψ production at forward and backward rapidity, 1.2 < | y | < 2.2 , as a function of J/ψ transverse momentum (pT) and Feynman- x (x F). The data analyzed were recorded by the PHENIX experiment at the Relativistic Heavy Ion Collider in 2015 from p+p, p+Al, and p+Au collisions with transversely polarized proton beams atmore » $$\sqrt{s}$$$_ {NN}$$ = 200 GeV . At this collision energy, single-spin asymmetries for heavy-flavor particle production of p + p collisions provide access to the spin-dependent gluon distribution and higher-twist correlation functions inside the nucleon, such as the gluon Qiu-Sterman and trigluon correlation functions. Proton + nucleus collisions offer an excellent opportunity to study nuclear effects on the correlation functions. The data indicate a positive asymmetry at the two-standard-deviation level in the p+p data for 2 GeV / c < p T < 10 GeV / c at backward rapidity and negative asymmetries at the two-standard-deviation level in the p + Au data for p T < 2 GeV/c at both forward and backward rapidity, while in p + Al collisions the asymmetries are consistent with zero within the range of experimental uncertainties.« less